\Sain"foin\ (?; 277), n. [F., fr. sain wholesome (L. sanus; see {Sane}.) + foin hay (L. f[ae]num); or perh. fr. saint sacred (L. sanctus; see {Saint}) + foin hay.] (Bot.) (a) A leguminous plant ({Onobrychis sativa}) cultivated for fodder. [Written also {saintfoin}.] (b) A kind of tick trefoil ({Desmodium Canadense}). [Canada]